In a world without harmony, a group of ponies will fight not to save this world, but to earn entry to the one safe haven left in it. Canterlot.

Sex tag: One chapter will/does prominently feature a brothel. Although it is never out right stated what it is or what goes on there, the implications are heavy enough to know what it is if you're teen+ like the story is rated for. Plus some jokes probably fall under this.

Gore tag: Light gore, although the punctuation to most fights that happen will be a bit heavier. Hopefully nothing that would make you sick, since gore isn't really in my taste either.